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Originally posted by Unkle Greggo
For the last time, the steel did not have to melt. It only had to weaken.
Nobody ever proved anything by ignoring facts.
Also, the transponders in the planes were turned off. It's damn near impossible to find a plane once the transponder has been shut off.
At 8:41, in American's operations center, a colleague told Marquis that the air traffic controllers declared Flight 11 a hijacking and "think he's [American 11] headed toward Kennedy [airport in New York City].They're moving everybody out of the way. They seem to have him on a primary radar. They seem to think that he is descending."37
At 9:29, the autopilot on American 77 was disengaged; the aircraft was at 7,000 feet and approximately 38 miles west of the Pentagon.59 At 9:32, controllers at the Dulles Terminal Radar Approach Control "observed a primary radar target tracking eastbound at a high rate of speed." This was later determined to have been Flight 77.
On 9/11, the terrorists turned off the transponders on three of the four hijacked aircraft. With its transponder off, it is possible, though more difficult, to track an aircraft by its primary radar returns.
Originally posted by Griff
Take a piece of steel and light a fire under it. Does it lose enough strength to collapse, bend, warp, whatever?
Originally posted by Griff
BTW, NIST tried this with replicas of the actual office fires at WTC. They used twice the amount of loading on the members and twice the amount of heat energy and twice the amount of time. Guess what. They only got the trusses to deform 2 inches and not the 50 some they desired and needed to prove their theory correct.
Originally posted by Griff
Also, the transponders in the planes were turned off. It's damn near impossible to find a plane once the transponder has been shut off.
How did they track the planes on 9/11 then?
Originally posted by nicepants
It depends on the load it's supporting. Steel loses 90% of its strength at 1100C. It loses 50% of its strength below 700C.
Because they tested trusses with full, undamaged fireproofing. Without this fireproofing the steel can't stand up to such extreme temperatures.
As part of its progress report, NIST has included an interim report that documents the procedures and practices used to provide the passive fire protection (fireproofing) for the floor system of the WTC towers. Nothing in the interim report—based on a review of factual data in documents obtained by NIST—should be taken to imply that the floor trusses played a critical role in the collapse of the WTC towers. The fireproofing issue is a key component of the ongoing NIST investigation.
Originally posted by hockeyplayer12
*TWA Flight 800 was a commerical aircraft, flying over the Atlantic Ocean and with 3/4 fuel with it slammed into the Atlantic Ocean. 85%-91% of the aircraft was recovered and re-assembled. But the plane that hit the pentagon decintegrated?
I have about 700 more questions no one has answered!
Have you gone to your local high school physics teacher? They can explain this.
Originally posted by hockeyplayer12
*You can drop a 20lbs bowling ball, tennis ball and penny from the top of the WTC which was 1,350Ft and neither one would fall at the speed of gravity. If you were to record those balls fall and play the fottage of the towers falling the towers would beat them to the ground.
Where did you find the no object can fall at 200 mph? I have been over 700 mph straight down. Did you make up this question and the 200 mph stuff?
Originally posted by hockeyplayer12
*No object on earth can fall at 200mph, every object would reach its terminal velocity before it reached 200mph (FACT). You could drop the Great Wall of China from any height you choose and it will never reach 200mph. All 3 buildings on WTC fell at over 200mph (or 10seconds or less).HOW?
Originally posted by Griff
Originally posted by nicepants
It depends on the load it's supporting. Steel loses 90% of its strength at 1100C. It loses 50% of its strength below 700C.
Below 700C?
Originally posted by Griff
Because they tested trusses with full, undamaged fireproofing. Without this fireproofing the steel can't stand up to such extreme temperatures.
I've heard the tests included non-fireproofed steel as well. Not confirmed yet.
Originally posted by Griff
I thought that the trusses pulling in the columns were THE critical role in the collapse of the WTC towers?
[edit on 4/10/2008 by Griff]
Originally posted by nicepants
Floor trusses sagged, pulling in the exterior columns. This is shown in photographs and explained in detail in NIST's final report.
Originally posted by nicepants
650C to be precise.
No, they had no reason to test non-fireproofed steel. They did the experiment to determine if the undamaged fireproofing was adequate.
Originally posted by jmdewey60
Anyone who knows anything can look at the video of the towers falling and see them exploding with tremendous force and an energy output that is multiples of whatever stored kenetic energy could have been stored in the building.
What I saw as a "Live feed" when the second tower was hit was fake and made ahead of time, to be played as live.
Originally posted by jmdewey60
The named hijackers were decoys and I know that directly from a friend who knew Attah, and his friends.
Originally posted by Griff
Originally posted by nicepants
650C to be precise.
Can you show where the WTC steel reached this temperature? Can you also show what the FOS was for the steel? If over 2, then even loosing 50% of strength would do nothing.
Originally posted by GriffAlso, you forgot to mention what happens to the strength of steel once it returns to below these threshold points. What happens again? It regains it's strength. Like what would happen once a fire moves to another area and the steel cools down a bit (if it ever got to those temperatures to begin with).
Originally posted by Griff
No, they had no reason to test non-fireproofed steel. They did the experiment to determine if the undamaged fireproofing was adequate.
Their hypothesis is that the fireproofing had a major role in the collapse. But, it wasn't important for them to find out for sure? Does that sound scientific?
Originally posted by Griff
Originally posted by nicepants
Floor trusses sagged, pulling in the exterior columns. This is shown in photographs and explained in detail in NIST's final report.
What of the core columns? What of the complete collapse? Are those also detailed in the NIST report?
Edit: Since I don't agree with some of NIST's conclusions, could you site something other than the NIST report to back up these claims? It's like trying to prove God's existence by quoting the bible.
[edit on 4/10/2008 by Griff]
Originally posted by nicepants
You can look at the NIST report to see the estimated temperatures of different areas of the fire-affected floors.
The photographs showing inward bowing of the exterior columns show that the floor spans were sagging and therefore pulling in on those columns.
If it were able to cool down to pre-fire temperatures, it would regain its rigidity, but if the heat caused it to deflect, the deflection would remain.
They tested a fireproofed floor span to ensure that the applied fireproofing would have been adequate had it been undamaged. They determined that to be the case. In the WTC towers, however, the fireproofing was affected by the high speed impacts of Boeing 757s.
Originally posted by nicepants
If you believe that their report is invalid, then I suggest you start another thread explaining why, in detail, your opinion on the matter should be accepted over the scientific conclusions of the experts who authored the report.